Category: javascript

I am having an issue displaying images on a canvas when it clicks. I am using a bit of Ajax as well to get the city names from an array of JSON Objects (these city names correspond to different plane images that I am trying to display).

For example when I click the canvas nothing appears on the canvas but when I go to inspect element/network it shows that its getting the images.

The code that I used to display the images:

function drawPlanes() {
canvas = document.getElementById("myCanvas");
ctx = canvas.getContext("2d");
var max = 1000;
var min = 553;
var cityNames = schedule["cities"];
var randomCity = cityNames[Math.floor(Math.random()*cityNames.length)].city;

var planeImage = new Image();
planeImage.onload = function() {
    ctx.drawImage(planeImage, Math.random() * (max - min) + min, Math.random() * (max - min) + min);
};
planeImage.src = findImage(randomCity);
}

This is the findImage function that I use to determine what Image it is and from that write the source:

function findImage(cityNames) { 
if (cityNames == "Iqaluit" || cityNames == "Whitehorse" || cityNames == "Yellowknife") {
    return "img/plane.jpg";
}
    
if (cityNames == "Halifax" || cityNames == "Charlottetown" || cityNames == "Winnipeg" 
        || cityNames == "Regina" || cityNames == "Edmonton" 
            || cityNames == "Victoria" || cityNames == "Toronto") {

    return "img/" + cityNames.toLowerCase() + ".jpg";
}

if (cityNames == "Fredericton" || cityNames == "Ottawa" || cityNames == "Quebec") {
    return "img/" + cityNames.toLowerCase() + ".png";

}

if (cityNames == "St. John") {
    return "img/stjohn.jpg";
}}

In summary I am just having an issue actually displaying the images on the canvas when it is clicked. Hope this is clear.

this is js code with some ids from my HTML page
when I press the button with click event the function doesn’t work and the code in the console disappear

let users = [{user:" moh ", password: " 1234 "}, {user:"Jouza", password: "5678"} ]

const name1 = document.querySelector("#Text")

const pass = document.querySelector("#pass1")

const login1 = document.querySelector("#btn")

const paragraph = document.querySelector("#par")

function verify(){

console.log("verify called")
const currentUser = name1.innertext.value
const currentpassword = pass.innertext.value

for(let i = 0; i>users.length; i++){
if( users[i].user === currentUser && users[i].password === currentpassword){

paragraph.innertext="Login Success";

`paragraph.style.backgroundColor="green";`

`return;`

}
}

paragraph.innertext="Login Failed";

paragraph.style.backgroundColor="red";

return;

}

login1.addEventListener("click",verify)

First off I just wanna state that I know next to nothing when it comes to Javascript so forgive me if I use the wrong jargon.

I’m trying to do a layout for tumblr where the sidebar image will change upon refresh.
I’m using an existing layout and following another tutorial on how to achieve the effect.

The CSS class for the sidebar is called “side-img”.

The CSS from the original layout is as below

<img class="side-img" src="{image:Sidebar Image}">  

From another tutorial, I’m asked to replace it with the following code to get the changing sidebar image working.

<script language="JavaScript">
<!--
 
 
function random_imglink(){
var myimages=new Array()
//specify random images below. You can have as many as you wish
myimages[1]="IMAGE URL"
myimages[2]="IMAGE URL"
myimages[3]="IMAGE URL"
 
 
var ry=Math.floor(Math.random()*myimages.length)
if (ry==0)
ry=1
document.write('<img src="'+myimages[ry]+'" border=0>')
}
random_imglink()
//-->
</script>

The sidebar image does change upon refresh but now it also loses all the CSS class style which has been set for it in the original layout (e.g. rounded corner, border width, colour etc).

Seeking advice on this. Thanks!

I am creating a script for a custom menu with clickable buttons that can be used for either opening new windows with new buttons, or placing functions behind buttons for playing music in game ect.

The problem I am facing is that whenever you close the menu by clicking on the “Close” button, and open the menu again, the even is executed twice. When you repeat this, it happens 4 times, then 8 and so on. It seems that it “addEventHandler” is not closed and when the menu is opened again, a new handler is created. Now we have all these events running, and doing the same thing duplicating everything.

This is the code from Javascript.

window.addEventListener('message', function(event) {

  MenuName = event.data.MenuName
  MenuTitle = event.data.MenuTitle
  MenuOptions = event.data.MenuOptions

  if (MenuName == 'MainMenu') {
    $('#npc-header').html(MenuTitle);
    for (let i = 0; i < MenuOptions.length; i++) {
      if (i <= 6) {
        $("#option" + i).show();
        $("#option" + i).html(MenuOptions[i].Title);
        $(document).on('click', "#option" + i, function() {
          if (MenuOptions[i].Type == 'Menu') {
            if (MenuOptions[i].Title == 'Settings') {
              $.post('https://DokusCore--Menu/OpenSettingsMenu', JSON.stringify({}));
            };
            if (MenuOptions[i].Title == 'Functions') {
              $.post('https://DokusCore--Menu/OpenFunctionsMenu', JSON.stringify({}));;
            };
            if (MenuOptions[i].Title == 'Music') {
              $.post('https://DokusCore--Menu/OpenMusicMenu', JSON.stringify({}));;
            };
          } else if (MenuOptions[i].Type == 'Option') {
            if (MenuOptions[i].Title == 'Open Inventory') {
              $.post('https://DokusCore--Menu/Close', JSON.stringify({}));
              $('body').fadeOut();
              $.post('https://DokusCore--Menu/OpenInventory', JSON.stringify({}));
            };
          };
        });
      };

      if (i < 6) {
        for (let i = MenuOptions.length; i < 6; i++) {
          $("#option" + i).hide();
        };
      };
    };
  };

  if (MenuName == 'SettingsMenu') {
    $('#npc-header').html(MenuTitle);
    for (let i = 0; i < MenuOptions.length; i++) {
      if (i <= 6) {
        $("#option" + i).show();
        $("#option" + i).html(MenuOptions[i].Title);
        $(document).on('click', "#option" + i, function() {
          if (MenuOptions[i].Type == 'Menu') {

          } else if (MenuOptions[i].Type == 'Option') {

            if (MenuOptions[i].Title == 'Toggle Music') {
              $.post('https://DokusCore--Menu/ToggleMusic', JSON.stringify({}));
            };

          };
        });
      };

      if (i < 6) {
        for (let i = MenuOptions.length; i < 6; i++) {
          $("#option" + i).hide();
        };
      };
    };
  };


  $('body').fadeIn();
});

// Close the menu
$(document).on('click', ".btn-closeinterface", function() {
  $('body').fadeOut();
  $.post('https://DokusCore--Menu/Close', JSON.stringify({}));
});

Anyone an idea how to close this event whenever the user clicks on the close button ?

Many thanks in advance!

I am building a calculator app and need to append numbers to a display. I also need to either append a non-number like * /, or clear the display and use a function to do that. Both don’t work because I can’t clear the display or append non-numbers to the display. Thanks in advance!

Heres part of my code-

<script> let displayobj = 0; </script>

Then having

<p  id ="display" bind:this={displayobj}></p> 

In the display
It works for numbers like this
<button class="button" on:click={displayobj.append(9)}>9 </button>

But It doesn’t work for non numbers like* / – + symbols, and gives me a red line when i do this
<button class="button" on:click={displayobj.append(*)}>*</button>

Also when I try to clear the number like this

<button class="button" on:click={displayobj = 0}>Clear</button>

It doesn’t work and freezes
my code so I can’t append anything anymore.

So I tried to have a function do it like this

<button class="button" on:click={clear}>Clear</button>

Then having this

<script> function clear(){ displayobj = 0; }</script>

But that didn’t work either can you tell me why? Thank you!

Lets look at the code below

import React from "react"

export default function App() {
    const [isGoingOut, setGoingOut] = React.useState(false);
    
    function yeet() {
        setGoingOut(prevValue => prevValue ? false : true);    
    }
    
    return (
        <div className="state">
            <h1 className="state--title">Do I feel like going out tonight?</h1>
            <div className="state--value" onClick={yeet}>
                <h1>{isGoingOut ? "Yes" : "No"}</h1>
            </div>
        </div>
    )
}

I’m calling the set function setGoingOut() through the function yeet(). However, if I directly call the setGoingOut() function as below

import React from "react"

export default function App() {
    const [isGoingOut, setGoingOut] = React.useState(false);
    
    setGoingOut(prevValue => prevValue ? false : true);
    
    return (
        <div className="state">
            <h1 className="state--title">Do I feel like going out tonight?</h1>
            <div className="state--value" onClick={setGoingOut}>
                <h1>{isGoingOut ? "Yes" : "No"}</h1>
            </div>
        </div>
    )
}

it throws an error. Is this related to the React philosophy of not letting the state be changed directly (the same reason we can’t change a state variable count as count++ but have to do count + 1?

We create MWEs as part of our job descriptions when hiring freelancers and our current one requires launching a python API through a simple shell script and opening a simple index.html file in the browser. We can get around the CORS issue(s) by disabling web security on browser launch. However, we can’t seem to get the browser to accept the AJAX call (see below for more details). Is it possible to configure the call so it uses 127.0.0.1 or maybe localhost? Asking our freelancers to set up webservers and/or to port forward their routers would scare many of them away.

AJAX Call:

await $.ajax({
    type: 'POST',
    url: 'http://127.0.0.1/health'
});

I am attempting to send a fax with the Vitelity API. I have an API on EC2 that I am calling from the front-end of my React Native app, and that in turn calls the Vitelity API:

const Base64String = async (req, res) => {
  let body = req.body;
  await postFax(body);
  return res.status(200).send({
    statusCode: 200,
    data: {
      ...body,
    },
  });
};

const postFax = async ({
  login,
  pass,
  faxnum,
  faxsrc,
  recname,
  file1,
  data1,
}) => {
  const VITELITY_URL = `https://api.vitelity.net/fax.php?login=${login}&pass=${pass}&cmd=sendfax&faxnum=${faxnum}&faxsrc=${faxsrc}&recname=${recname}&file1=${file1}&data1=${data1}`;

  await fetch(VITELITY_URL, {
    method: "POST",
  })
    .then((res) => res.text())
    .then((result) => {
      console.log(result);
    })
    .catch((err) => console.log(err));
};

data1 is Base64 encoded and works with a test image I have that is ~24k characters, however some of the images I’m taking have been upwards of 1.2m characters.

The exact issue I’m getting is 414 Request-URI Too Large.

This is the front-end:

const sendB64 = b64 => {
    let formdata = new FormData();
    formdata.append('login', testLogin);
    formdata.append('pass', testPass);
    formdata.append('cmd', 'sendfax');
    formdata.append('faxnum', destinationNumber);
    formdata.append('faxsrc', testSenderNumber);
    formdata.append('recname', 'Test');
    formdata.append('file1', 'testfax.jpg');
    formdata.append('data1', b64);

    let requestOptions = {
      method: 'POST',
      headers: {
        'Content-Type': 'multipart/form-data',
      },
      body: formdata,
      redirect: 'follow',
    };

    fetch(API_URL, requestOptions)
      .then(response => response.json())
      .then(result => {
        console.log(result);
        showMessage({message: `status: ${result.statusCode}`});
      })
      .catch(error => console.log('error', error));
  };

I want to check if two different events were triggered by the same user action.
For example, I have a “keydown” event listener and a “beforeinput” event listener with an editable div.
Is there a way I can check if both events were triggered by the same key press?
I know I could do it in a hacky way checking the time between the events, but is there a reliable/deterministic way to know if the events were triggered by the same input from the user?

If not a specific property, is there maybe a more reliable way to increment an id number after each event loop or push a callback to the end of the stack after the event loop to know the events on the stack would have all needed to be added at the same time by the same user input before the user would have been able to press another key or do another action?

I have a file input like this in html

<input type='file' id='textin'></input>

How Do I Get The Contents Of The .txt File Uploaded?

I’ve a shared directory reachable by html page in this way

<div onclick="windows.open('file://mypath/mysharefolder','_blank');">Shared folder</div>

This works with internet explorer, but not with Chrome browser (error: Not allowed to load local resource).
So I’ve thought of replacing the link with a tag to allow the download of a lnk file (created manually) containing the path of the shared directory like this

<a href="mylinktofolder.lnk" download>Shared folder</a>

this tag works to download other kind of file (img,pdf,…), but not with lnk file; download in Chrome fails because doesn’t find file mylinktofolder.download.

Is it possible to download such a file?

Thanks in advance

I’m trying to create a custom WordPress gutenberg block that allows me to edit the second a a paragraph.

I can create the block using this code and I can see content on the frontend of the site however the block crashes if I view the block to edit it.

The console gives the following error:

Block validation: Expected attribute class of value wp-block-cgb-block-test-gutenberg-block, saw text-blueGray-700 .

Block validation: Block validation failed for cgb/block-test-gutenberg-block ({name: ‘cgb/block-test-gutenberg-block’, icon: {…}, keywords: Array(3), attributes: {…}, providesContext: {…}, …}).

Content generated by save function…..

My code is:

attributes: {
    content: {
        type: 'array',
        source: 'html',
        selector: 'p',
    }
},


edit: ( { attributes, setAttributes, className, isSelected } ) => {
    

    function onChangeContentName ( content ) {
        setAttributes({content: content})
    }

    let content = attributes.content // To bind attribute link_text

    // Creates a <p class='wp-block-cgb-block-test-gutenberg-block'></p>.
    return (

        

            <h1
                class="mx-auto mb-8 text-2xl font-semibold leading-none tracking-tighter text-black lg:text-3xl title-font">
                Test Site</h1>
            <p class="mx-auto text-base font-medium leading-relaxed text-blueGray-700 ">
  recreate this whole icon box component as UI of your gutenberg block; displaying site's title as a header and sites tagline at the bottom below the 2nd paragraph. 
  the 2nd paragraph should be editable.</p>
        </div>
    </div>
    <div class="w-full lg:w-1/3">
        <div class="h-full p-4 space-y-4 lg:rounded-r-xl rounded-b-xl lg:p-8 bg-blueGray-50">
            
                <RichText
                    tagName="p"
                    className={className} // Automatic class: gutenberg-blocks-sample-block-editable
                    onChange={onChangeContentName} // onChange event callback
                    value={content} // Binding
                    placeholder="Lorem impsum write your content..."
                />
            
            <h2 class="text-xs font-semibold tracking-widest text-black uppercase title-font"> Just another WordPress site
            </h2>
        </div>
        <div>
        </div>
    </div>
</div>

save: ( { attributes } ) => {
    
    return (

        <section class="text-blueGray-700 ">
<div class="container items-center px-5 py-8 mx-auto">
    <div class="flex flex-wrap justify-center mb-12 divide-y-2 lg:divide-y-0 lg:divide-x-2">
        <div class="w-full lg:w-1/3">
            <div class="p-4 rounded-t-xl lg:rounded-l-xl lg:p-8 bg-blueGray-50">
                <div
                    class="inline-flex items-center justify-center flex-shrink-0 w-12 h-12 mx-auto mb-5 text-black bg-blueGray-100 rounded-full">
                    <svg xmlns="http://www.w3.org/2000/svg" class="w-6 h-6 icon icon-tabler icon-tabler-aperture"
                        width="24" height="24" viewBox="0 0 24 24" stroke-width="1.5" stroke="currentColor"
                        fill="none" stroke-linecap="round" stroke-linejoin="round">
                        <path stroke="none" d="M0 0h24v24H0z" fill="none"></path>
                        <circle cx="12" cy="12" r="9"></circle>
                        <line x1="3.6" y1="15" x2="14.15" y2="15"></line>
                        <line x1="3.6" y1="15" x2="14.15" y2="15" transform="rotate(72 12 12)"></line>
                        <line x1="3.6" y1="15" x2="14.15" y2="15" transform="rotate(144 12 12)"></line>
                        <line x1="3.6" y1="15" x2="14.15" y2="15" transform="rotate(216 12 12)"></line>
                        <line x1="3.6" y1="15" x2="14.15" y2="15" transform="rotate(288 12 12)"></line>
                    </svg>
                </div>
                <h3 class="mb-4 text-xs font-semibold tracking-widest text-black uppercase title-font">test Option 2
                </h3>

                <h1
                    class="mx-auto mb-8 text-2xl font-semibold leading-none tracking-tighter text-black lg:text-3xl title-font">
                    Test Site</h1>
                <p class="mx-auto text-base font-medium leading-relaxed text-blueGray-700 ">
      recreate this whole icon box component as UI of your gutenberg block; displaying site's title as a header and sites tagline at the bottom below the 2nd paragraph. 
      the 2nd paragraph should be editable.</p>
            </div>
        </div>
        <div class="w-full lg:w-1/3">
            <div class="h-full p-4 space-y-4 lg:rounded-r-xl rounded-b-xl lg:p-8 bg-blueGray-50">
                
                    <RichText.Content tagName="p" value={ attributes.content } />
                
                <h2 class="text-xs font-semibold tracking-widest text-black uppercase title-font"> Just another WordPress site
                </h2>
            </div>
            <div>
            </div>
        </div>
    </div>
</div>

    );
}

i’m newbie in javascript but i need help, can i access or call from outside a variable inside const block ? here are the code :

  let selectedElement = _element.layer;
  const layerAttributes = {
    trait_type: _element.layer.trait,
    value: selectedElement.traitValue,
    ...(_element.layer.display_type !== undefined && {
      display_type: _element.layer.display_type,
    }),
  };
  console.log(layerAttributes);
  if (
    attributesList.some(
      (attr) => attr.trait_type === layerAttributes.trait_type
    )   
  )
    return;
  attributesList.push(layerAttributes);

};

I need to access layerAttributes from outside variable or const block, just in example access from console.log , inside block the console.log(layerAttributes); is working, but when i access from outside variable block is not working, any suggestion ?

Thanks in advance.

Building out a page using DNN for my job, I don’t like their shortcode button options, trying to code one myself. Main importance, I don’t know how to code from scratch. I can jack other code together for a functional element, usually.

Code below (alternatively, Codepen) is as far as I’ve gotten. I want a blue button, white text, and a white hover action, got that far. My issue is in getting the button to GO. I substituted a link to Facebook instead of our site. Really, I just want an easy fill in the blank code we can drop into any block on the site to quickly change colors, link, and shown text. I feel like I’m close, but not quite there. Any suggestions on making my button go??

        body {
          padding-left: 100px;
        }
    
        input#go {
          background-color: #4c9ed9;
          color: #ffffff;
          padding: 20px 40px;
          border: 1px solid #111;
        }
    
        input#go:hover {
          background-color: #ffffff;
          color: #4c9ed9;
          border: 1px solid #111;
        }

    <html>
    
    <head>
      <title>MK Button 2</title>
    </head>
    
    <body>
      <form>
      <input type="button" id="go" onclick="window.location.href='https://www.facebook.org';" value="Register">
      </form>
        </body>
    
    </html>

Is there a way to get Odysseyware to show the “Show Answer” button as a student? it is JavaScript.
I found the JavaScript for it, but I don’t know how to change it so it will show it.